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timing

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Table of Contents

Engine Timing

Engine timing is the most important thing in these engines. This is the dark art. Timing is what determines the performance level of the engine. This is where the biggest gains are. The second most important thing in the engine is the bore and stroke. This will tell you how the power curve will be shaped. Port count is the next important thing. However port count doesnt determine the performance nor the powerband. 3 Port engines can perform as good or better then 5, 7, 9, etc port engines. Higher port count doesnt mean more flow, it just means airflow control. With the addition of more ports you actually lose port area. So these extra ports are just shaping the flow through the sleeve into the chamber. This has affects on the air fuel mixture in the chamber.

Engine Timing Table

This is the most complete timing number database that you will find for RC Nitro engines.

Note: In obtaining this info there was modified timings as well. I consider this to be private information and im not willing to publicize someone elses private intellectual property. So any notes in relation to changes or what to do have been removed. I instead I tell you to do your own research and development. You will learn far more then you ever would copying. This site will only show engines that you can or could at the time buy off the shelf as stock or tuned by the factory.

Special Thanks: 1st Racing Germany for the initial timing sheet off of their old website. Roelof Tooms of the Netherlands and Adam Blevins from the late AB Mods in USA for the timing numbers of all of the engines that came through their hands.

The timing of the sleeve ports is only listed once, as these have the same degree opening and closing time anyway. Only the crankshaft opening and closing times are not symmetrical. In times where there is number+number then that means it is a multi port exhaust and the timings differ. The higher timing number is on the outer ports. Additionally if you see Boost and Timing have the same numbers its because they are the same. Differences in these started showing up in the late 90s/early 2000s engines.

Alpha

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Alpha F850 5 Port (Stock) 21 16.30 x 16.80 63.5 Degrees 127 Degrees 63.5 Degrees 127 Degrees 87 Degrees 174 Degrees 42 Degrees 60 Degrees 198 Degrees N/A
Alpha Z852 7 Port (Stock) 21 16.26 x 16.80 63.5 Degrees 127 Degrees 63.5 Degrees 127 Degrees 87 Degrees 174 Degrees 42 Degrees 60 Degrees 198 Degrees N/A

Arrow Racing

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Arrow Racing GTR21 (Stock) 21 16.60 x 16.00 65 Degrees 130 Degrees 65 Degrees 130 Degrees 84 Degrees 168 Degrees 25 Degrees 73 Degrees 228 Degrees N/A

Axe Rossi

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
AXE Rossi Cobra (Stock) 21 16.00 x 17.40 65 Degrees 130 Degrees 65 Degrees 130 Degrees 83 Degrees 166 Degrees 34 Degrees 64 Degrees 210 Degrees Notes 1)
AXE Rossi Cobra X1 Evo (Stock) 21 16.00 x 17.40 62 Degrees 124 Degrees 62 Degrees 124 Degrees 83+89 Degrees 166+178 Degrees 36 Degrees 64 Degrees 208 Degrees Notes 2)
AXE Rossi Mamba (Stock) 21 16.44 x 16.48 62 Degrees 124 Degrees 62 Degrees 124 Degrees 84 Degrees 168 Degrees 37 Degrees 63 Degrees 206 Degrees N/A
AXE Rossi Mamba X1 Evo (Stock) 21 16.44 x 16.48 62 Degrees 124 Degrees 62 Degrees 124 Degrees 84+89.5 Degrees 168+179 Degrees 33 Degrees 64 Degrees 211 Degrees N/A

Axial

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Axial 32 Spec 1S (Stock) 21 19.5 x 17.50 64 Degrees 128 Degrees 64 Degrees 128 Degrees 87.5 Degrees 175 Degrees 34 Degrees 48 Degrees 194 Degrees N/A

Cipolla

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Cipolla Buggy (Stock) 21 16.00×17.22 64 Degrees 128 Degrees 64 Degrees 128 Degrees 84 Degrees 168 Degrees 38 Degrees 55 Degrees 197 Degrees N/A
Cipolla MC28 Free Climber (Stock) 28 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 85 Degrees 170 Degrees 33 Degrees 62 Degrees 209 Degrees N/A

CMB

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
CMB Evo4-R (Stock) 21 16.15×17.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 87 Degrees 174 Degrees 23 Degrees 68 Degrees 225 Degrees N/A
CMB 21RS (Stock) 21 16.33×16.70 63 Degrees 126 Degrees 63 Degrees 126 Degrees 93 Degrees 186 Degrees 28 Degrees 65 Degrees 217 Degrees N/A

Dynamite

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Dynamite Mach 28 (Stock) 21 18.50×17.00 59 Degrees 118 Degrees 59 Degrees 118 Degrees 84 Degrees 168 Degrees 48 Degrees 45 Degrees 177 Degrees N/A

Go Tech

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Go 25 (Stock) 21 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 84 Degrees 168 Degrees 32 Degrees 59 Degrees 207 Degrees N/A
Go 25 Pro (Stock) 21 00.00×00.00 84 Degrees 168 Degrees 84 Degrees 168 Degrees 84 Degrees 168 Degrees 32 Degrees 59 Degrees 168 Degrees N/A
Go 21R/Pro 7P+2 (Stock) 21 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 83 Degrees 166 Degrees 33 Degrees 60 Degrees 207 Degrees N/A
Go 21-7PT (Stock) 21 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 84 Degrees 168 Degrees 34 Degrees 55 Degrees 201 Degrees N/A
Go 21 GX5R (Stock) 21 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 84 Degrees 168 Degrees 32 Degrees 57 Degrees 205 Degrees N/A

HPI

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
HPI Nitro Star T15 (Stock) 15 15.00×13.60 57 Degrees 114 Degrees 57 Degrees 114 Degrees 82 Degrees 164 Degrees 28 Degrees 48 Degrees 200 Degrees N/A

Infinity

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Infinity Samurai 521 (Stock) 21 00.00×00.00 64 Degrees 128 Degrees 64 Degrees 128 Degrees 88 Degrees 176 Degrees 44 Degrees 56 Degrees 192 Degrees N/A

JP Racing

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
JP Racing BR21SBK01 (Stock) 21 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 86 Degrees 172 Degrees 36 Degrees 62 Degrees 206 Degrees N/A
JP Racing PR21 P5 (Stock) 21 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 85 Degrees 170 Degrees 37 Degrees 61 Degrees 204 Degrees N/A
JP Racing FX21-B5T (Stock) 21 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 84.5 Degrees 169 Degrees 33 Degrees 62 Degrees 209 Degrees N/A

Kyosho

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Kyosho GXR15 (Stock) 15 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 75 Degrees 150 Degrees 28 Degrees 44 Degrees 196 Degrees N/A

LRP

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
LRP .30 Spec II (Stock) 21 00.00×00.00 59 Degrees 118 Degrees 59 Degrees 118 Degrees 84 Degrees 168 Degrees 26 Degrees 61 Degrees 215 Degrees N/A

Max Power

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Max Power/Max Thunder 21 (Stock) 21 00.00×00.00 60 Degrees 120 Degrees 60 Degrees 120 Degrees 84 Degrees 168 Degrees 36 Degrees 60 Degrees 204 Degrees N/A

Nosram

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Nosram RS21 Evo Buggy (Stock) 21 00.00×00.00 67 Degrees 134 Degrees 67 Degrees 134 Degrees 87 Degrees 174 Degrees 35 Degrees 62 Degrees 207 Degrees N/A

Nova Mega

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
NovaMega MF21 (Massimo Fantini) 21 00.00×00.00 65 Degrees 130 Degrees 65 Degrees 130 Degrees 93 Degrees 186 Degrees 33 Degrees 60 Degrees 207 Degrees N/A
NovaMega MF12 (Massimo Fantini) 12 00.00×00.00 60 Degrees 120 Degrees 60 Degrees 120 Degrees 86.5 Degrees 173 Degrees 35 Degrees 58 Degrees 203 Degrees N/A

Novarossi

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Novarossi S421B (Stock) 21 00.00×00.00 62 Degrees 124 Degrees 62 Degrees 124 Degrees 84 Degrees 168 Degrees 36 Degrees 60 Degrees 204 Degrees N/A
Novarossi S8921B (Stock) 21 00.00×00.00 62 Degrees 124 Degrees 62 Degrees 124 Degrees 81.5 Degrees 163 Degrees 32 Degrees 63 Degrees 195 Degrees N/A
Novarossi Toro Nero (Stock) 21 15.88×17.60 67 Degrees 134 Degrees 67 Degrees 134 Degrees 82 Degrees 164 Degrees 32 Degrees 64 Degrees 212 Degrees Notes 3)
Novarossi Toro Nero Team (Stock) 21 15.88×17.60 64 Degrees 128 Degrees 64 Degrees 128 Degrees 82+85 Degrees 164+170 Degrees 31 Degrees 64 Degrees 213 Degrees N/A
Novarossi 35Plus21 LC/WC Cordoba Edition (Stock) 21 00.00×00.00 64 Degrees 128 Degrees 64 Degrees 128 Degrees 91 Degrees 182 Degrees 34 Degrees 63 Degrees 209 Degrees N/A
Novarossi TS1 (Stock) 12 00.00×00.00 59 Degrees 118 Degrees 59 Degrees 118 Degrees 87 Degrees 174 Degrees 35 Degrees 56 Degrees 201 Degrees N/A
Novarossi N12T1 (Stock) 12 00.00×00.00 57 Degrees 114 Degrees 57 Degrees 114 Degrees 84 Degrees 168 Degrees 35 Degrees 56 Degrees 201 Degrees N/A
Novarossi NSR12S3 (Stock) 12 00.00×00.00 58 Degrees 116 Degrees 58 Degrees 116 Degrees 79.5 Degrees 159 Degrees 26 Degrees 70 Degrees 224 Degrees N/A
Novarossi 353 Race (Stock) 12 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 86.5 Degrees 173 Degrees 35 Degrees 66 Degrees 211 Degrees N/A
Novarossi Rex BR21SB01 (Stock) 21 00.00×00.00 58 Degrees 116 Degrees 58 Degrees 116 Degrees 78 Degrees 156 Degrees 39 Degrees 66 Degrees 207 Degrees N/A
Novarossi Rex 12 (unknown model) (Stock) 12 00.00×00.00 58 Degrees 116 Degrees 58 Degrees 116 Degrees 78 Degrees 156 Degrees 33 Degrees 58 Degrees 205 Degrees N/A

MR Ninja

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Ninja MR21-B01 (Stock) 21 00.00×00.00 65 Degrees 130 Degrees 65 Degrees 130 Degrees 86 Degrees 172 Degrees 29 Degrees 62 Degrees 213 Degrees N/A

JX Ninja

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Ninja JX21-B01 (Stock) 21 00.00×00.00 62 Degrees 124 Degrees 62 Degrees 124 Degrees 86 Degrees 172 Degrees 33 Degrees 66 Degrees 213 Degrees N/A
Ninja JX21-B01A (Stock) 21 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 83 Degrees 166 Degrees 33 Degrees 65 Degrees 212 Degrees N/A

Ofna

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Ofna Force Blue 21 (Stock) 21 00.00×00.00 64 Degrees 128 Degrees 64 Degrees 128 Degrees 80 Degrees 160 Degrees 32 Degrees 54 Degrees 202 Degrees N/A
Ofna Hyper 21 3P (Stock) 21 00.00×00.00 62 Degrees 124 Degrees 62 Degrees 124 Degrees 83.5 Degrees 167 Degrees 40 Degrees 55 Degrees 195 Degrees N/A

OPS

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
OPS 21RE On Road (Stock) 21 00.00×00.00 64 Degrees 128 Degrees 64 Degrees 128 Degrees 89 Degrees 178 Degrees 36 Degrees 59 Degrees 203 Degrees N/A
OPS 21 Off Road (Stock) 21 00.00×00.00 66.5 Degrees 133 Degrees 66.5 Degrees 133 Degrees 91.5 Degrees 183 Degrees 34 Degrees 63 Degrees 209 Degrees N/A
OPS SFV-21V (Stock) 21 00.00×00.00 66 Degrees 132 Degrees 66 Degrees 132 Degrees 88 Degrees 176 Degrees 33 Degrees 66 Degrees 213 Degrees N/A

Orcan

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Orcan PR115 (Stock) 15 00.00×00.00 62 Degrees 124 Degrees 62 Degrees 124 Degrees 82 Degrees 164 Degrees 49 Degrees after BDC 43 Degrees after TDC 174 Degrees N/A

OS Max

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
OS Max 18 CV-R (Stock) 18 00.00×00.00 55 Degrees 110 Degrees 55 Degrees 110 Degrees 80 Degrees 160 Degrees 37 Degrees 61 Degrees 204 Degrees N/A
OS MAX 18 TZ/P (Stock) 18 00.00×00.00 59 Degrees 118 Degrees 59 Degrees 118 Degrees 81 Degrees 162 Degrees 34 Degrees 58 Degrees 204 Degrees N/A
OS Max 21 VZ-B (Stock) 21 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 85 Degrees 170 Degrees 37 Degrees 66 Degrees 209 Degrees N/A
OS Max 21 VZ-B V-SPEC (Stock) 21 00.00×00.00 66 Degrees 132 Degrees 66 Degrees 132 Degrees 86 Degrees 172 Degrees 30 Degrees 71 Degrees 221 Degrees N/A
OS Max 21XM Outboard Rev Rot (Stock) 21 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 80.5 Degrees 161 Degrees 40 Degrees 61 201 Degrees N/A
OS Max 21 XZ-B (Stock) 21 00.00×00.00 62 Degrees 124 Degrees 62 Degrees 124 Degrees 86 Degrees 172 Degrees 35 Degrees 65 Degrees 210 Degrees N/A
OS Max 25 XZ (Stock) 25 00.00×00.00 66 Degrees 132 Degrees 66 Degrees 132 Degrees 85 Degrees 170 Degrees 34 Degrees 63 Degrees 209 Degrees N/A
OS Max 28 XZ (Stock) 28 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 88 Degrees 176 Degrees 35 Degrees 65 Degrees 210 Degrees N/A

OS Speed

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
OS SPEED 12 TZ (Stock) 12 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 94 Degrees 188 Degrees 31 Degrees 63 Degrees 212 Degrees N/A
OS SPEED 21 VZ-B VSPEC II (Stock) 21 00.00×00.00 65 Degrees 130 Degrees 65 Degrees 130 Degrees 86 Degrees 172 Degrees 29 Degrees 68 Degrees 219 Degrees N/A

Picco

Engine Size Bore x Stroke (mm) Exhaust Timing Exhaust Duration Overflows Transfer Duration Crank Rotor Open Crank Rotor Close Rotor Duration Notes
Picco P3 .26 (Stock) 26 00.00×00.00 82 Degrees 164 Degrees 58 Degrees 116 Degrees 36 Degrees after BDC 54 Degrees after TDC 198 Degrees N/A
Picco P3 .28 (Stock) 28 00.00×00.00 85 Degrees 170 Degrees 61 Degrees 122 Degrees 37 Degrees after BDC 59 Degrees after TDC 202 Degrees N/A
Picco-Mega ZX21 Circuit (Stock) 21 00.00×00.00 90 Degrees 180 Degrees 65 Degrees 130 Degrees 29 Degrees after BDC 62 Degrees after TDC 213 Degrees N/A
Picco P7-S (P7-8080) (Stock) 21 00.00×00.00 86 Degrees 172 Degrees 61 Degrees 122 Degrees 29 Degrees after BDC 59 Degrees after TDC 210 Degrees N/A
Picco P7-R (P7-8502) (Stock) 21 00.00×00.00 87 Degrees 173 Degrees 61 Degrees 122 Degrees 40 Degrees after BDC 61 Degrees after TDC 202 Degrees N/A
Picco P7-R Evo2 (P7-8502) (Stock) 21 00.00×00.00 86.5 Degrees 173 Degrees 61 Degrees 122 Degrees 40 Degrees after BDC 59 Degrees after TDC 199 Degrees N/A
Picco P7-R Evo3 Onroad (Stock) 21 00.00×00.00 89 Degrees 178 Degrees 65 Degrees 130 Degrees 37 Degrees after BDC 57 Degrees after TDC 200 Degrees N/A
Picco 21 Boost (Stock) 21 00.00×00.00 82+86 Degrees 164+171 Degrees 56+61 Degrees 122+122 Degrees 34 Degrees after BDC 58 Degrees after TDC 204 Degrees N/A

RB Concept

Engine Size Bore x Stroke (mm) Exhaust Timing Exhaust Duration Overflows Transfer Duration Crank Rotor Open Crank Rotor Close Rotor Duration Notes
RB Concept Blast Buggy (Stock) 21 00.00×00.00 79+85.5 Degrees 158+171 Degrees 66 Degrees 132 Degrees 40 Degrees after BDC 54 Degrees after TDC 194 Degrees N/A
RB Concept C6BB T7 (Stock) 21 00.00×00.00 87 Degrees 174 Degrees 64 Degrees 128 Degrees 40 Degrees after BDC 60 Degrees after TDC 200 Degrees Note 4)
RB Concept C6BB Buggy (Stock) 21 00.00×00.00 90 Degrees 180 Degrees 64 Degrees 128 Degrees 40 Degrees after BDC 60 Degrees after TDC 200 Degrees Note 5)
RB Concept C5BB Buggy (Stock) 21 00.00×00.00 88 Degrees 176 Degrees 64 Degrees 128 Degrees 42 Degrees after BDC 61 Degrees after TDC 199 Degrees N/A
RB Concept C5 Buggy (June 2002) (Rody) 21 00.00×00.00 90 Degrees 180 Degrees 65 Degrees 130 Degrees 35 Degrees after BDC 60 Degrees after TDC 205 Degrees N/A
RB Concept C5 Circuit (Stock) 21 00.00×00.00 87 Degrees 174 Degrees 63 Degrees 126 Degrees 31 Degrees after BDC 60 Degrees after TDC 209 Degrees N/A
RB Concept S5 Buggy (Oct 2007) (Stock) 21 00.00×00.00 85.5 Degrees 171 Degrees 65 Degrees 130 Degrees 40 Degrees after BDC 51 Degrees after TDC 191 Degrees N/A
RB Concept K12 (Stock) 12 00.00×00.00 79 Degrees 158 Degrees 57 Degrees 114 Degrees 42 Degrees after BDC 49 Degrees after TDC Degrees 187 N/A
RB Concept S7II (Stock) 21 00.00×00.00 88 Degrees 176 Degrees 65 Degrees 130 Degrees 43 Degrees after BDC 50 Degrees after TDC 187 Degrees N/A
RB Concept TJ9 (Stock) 21 00.00×00.00 83.5 Degrees 171 Degrees 56 Degrees 112 Degrees 35 Degrees after BDC 55 Degrees after TDC 200 Degrees N/A
RB Concept WS7II (Stock) 21 00.00×00.00 89 Degrees 178 Degrees 67 Degrees 134 Degrees 42 Degrees after BDC 55 Degrees after TDC 193 Degrees N/A
RB Concept WS7III (Stock) 21 00.00×00.00 88 Degrees 176 Degrees 63 Degrees 126 Degrees 50 Degrees after BDC 52 Degrees after TDC 192 Degrees N/A
RB Concept WS9(Stock) 21 00.00×00.00 82 Degrees 164 Degrees 66 Degrees 132 Degrees 44 Degrees after BDC 51 Degrees after TDC 187 Degrees N/A
RB Concept TM728 Monster (Stock) 28 00.00×00.00 82 Degrees 164 Degrees 61 Degrees 122 Degrees 49 Degrees after BDC 50 Degrees after TDC 181 Degrees N/A
RB Concept H9 (Stock) 21 00.00×00.00 86.5 Degrees 173 Degrees 66 Degrees 132 Degrees 40 Degrees after BDC 53 Degrees after TDC 193 Degrees N/A
RB Concept Shark 9 (Stock) 21 00.00×00.00 82+92 Degrees 164+184 Degrees 66 Degrees 132 Degrees 40 Degrees after BDC 59 Degrees after TDC 199 Degrees N/A
RB Matrix (Stock) 21 00.00×00.00 85 Degrees 170 Degrees 58 Degrees 116 Degrees 37 Degrees after BDC 70 Degrees after TDC 213 Degrees N/A
RB Concept USA (Stock) 21 00.00×00.00 86 Degrees 172 Degrees 66 Degrees 132 Degrees 41 Degrees after BDC 52 Degrees after TDC 191 Degrees N/A

RS Falcon

Engine Size Bore x Stroke (mm) Exhaust Timing Exhaust Duration Overflows Transfer Duration Crank Rotor Open Crank Rotor Close Rotor Duration Notes
RS Falcon FA21-B5 (Stock) 21 00.00×00.00 87 Degrees 174 Degrees 65 Degrees 130 Degrees 29 Degrees after BDC 60 Degrees after TDC 211 Degrees N/A
RS Falcon FA21-R7 Rally (Stock) 21 00.00×00.00 94 Degrees 188 Degrees 66.5 Degrees 133 Degrees 28 Degrees after BDC 60 Degrees after TDC 212 Degrees N/A
RS Falcon VZB VSPEC (Stock) 21 00.00×00.00 84 Degrees 168 Degrees 64 Degrees 128 Degrees 29 Degrees after BDC 71 Degrees after TDC 222 Degrees N/A

SH Engines

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
SH 28 (Stock) 28 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 83 Degrees 166 Degrees 37 Degrees 50 Degrees 193 Degrees N/A
SH Truggster 28 (Stock) 28 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 87 Degrees 174 Degrees 27 Degrees 57 Degrees 210 Degrees N/A

Sirio

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Sirio Kanai 21 CL3B (Stock) 21 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 85 Degrees 170 Degrees 30 Degrees 65 Degrees 215 Degrees N/A
Sirio Kanai 21 Evo2 (Stock) 21 00.00×00.00 67 Degrees 134 Degrees 67 Degrees 134 Degrees 88 Degrees 176 Degrees 33 Degrees 61 Degrees 208 Degrees N/A
Sirio Kanai S21BK Evo4 (Stock) 21 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 84 Degrees 168 Degrees 30 Degrees 69 Degrees 219 Degrees N/A
Sirio Kanai S21BK Evo4 STI (Stock) 21 00.00×00.00 64 Degrees 128 Degrees 64 Degrees 128 Degrees 85.5 Degrees 171 Degrees 33 Degrees 63 Degrees 210 Degrees N/A
Sirio S21 BXTIS (Stock) 21 00.00×00.00 66 Degrees 132 Degrees 66 Degrees 132 Degrees 87 Degrees 174 Degrees 35 Degrees 62 Degrees 207 Degrees N/A
Sirio 27 Monster 3 Port (Stock) 27 00.00×00.00 65 Degrees 130 Degrees 65 Degrees 130 Degrees 82 Degrees 164 Degrees 34 Degrees 60 Degrees 206 Degrees Notes 6)
Sirio 28 STI Monster (Stock) 28 00.00×00.00 65 Degrees 130 Degrees 65 Degrees 130 Degrees 84 Degrees 168 Degrees 35 Degrees 62 Degrees 207 Degrees Notes 7)

Tecnopower

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Tecnopower B01 (Stock) 21 00.00×00.00 65 Degrees 130 Degrees 65 Degrees 130 Degrees 87 Degrees 174 Degrees 30 Degrees 60 Degrees 210 Degrees N/A

Traxxas

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Traxxas TRX 2.5R (Stock) 15 00.00×00.00 60 Degrees 120 Degrees 60 Degrees 120 Degrees 77 Degrees 154 Degrees 36 Degrees 52 Degrees 196 Degrees N/A

Thunder Tiger

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Thunder Tiger Pro 21R 13mm Crank (Stock) 21 00.00×00.00 60 Degrees 120 Degrees 60 Degrees 120 Degrees 80 Degrees 160 Degrees 38 Degrees 51 Degrees 193 Degrees Note 8)
Thunder Tiger Pro 21R 14mm Crank (Stock) 21 00.00×00.00 63 Degrees 126 Degrees 63 Degrees 126 Degrees 79 Degrees 158 Degrees 33 Degrees 56 Degrees 203 Degrees Note 9)
Thunder Tiger Pro 28 (Stock) 28 00.00×00.00 56 Degrees 112 Degrees 56 Degrees 112 Degrees 78 Degrees 156 Degrees 30 Degrees 58 Degrees 208 Degrees N/A

Team Orion

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Team Orion CRF 21 Team Orion (Stock) 21 00.00×00.00 59 Degrees 118 Degrees 59 Degrees 118 Degrees 88.5 Degrees 177 Degrees 32 Degrees 58 Degrees 206 Degrees N/A
Team Orion CRF 21 Team Orion USA (Stock) 21 00.00×00.00 59 Degrees 118 Degrees 59 Degrees 118 Degrees 87 Degrees 174 Degrees 37 Degrees 54 Degrees 197 Degrees N/A
Team Orion Wasp 28 (Stock) 28 00.00×00.00 61 Degrees 122 Degrees 61 Degrees 122 Degrees 87 Degrees 174 Degrees 42 Degrees 56 Degrees 194 Degrees N/A

DEV

Engine Size Bore x Stroke (mm) Boost Timing Open ATDC Boost Duration Transfer Timing Open ATDC Transfer Duration Exhaust Timing Open ATDC Exhaust Duration Crank Rotor Open ABDC Crank Rotor Close ATDC Rotor Duration Notes
Engine (Stock) 21 0x0 B Degrees B Degrees T Degrees T Degrees E Degrees E Degrees R Degrees R Degrees R Degrees N/A
1) , 2)
The valve timing has been slightly modified compared to the 2006 engine. Like the RB engines of the C6BB series, Rossi now uses a MES (Multiexhaust) system with different exhaust timings, so that the main exhaust has a timing of 166° and the lead exhausts 178°. This promises a significant increase in torque without sacrificing revs. The port timings have also been slightly reduced, which also affects fuel consumption. The crankshaft timing was only slightly modified, but a significant difference – and this is what makes it special – is that the crankshaft is not potted with silicone, but instead has a hard plastic insert that covers the entire bore of the shaft. Even with improper engine treatment using the wrong preservative oils, there are no problems with the silicone swelling or the insert potentially falling out, especially since the plastic insert is additionally anchored in the crankshaft. The shaft is balanced twice using tungsten inserts. The main bearing, which is fitted with ceramic balls , is standard equipment on the X1 Evolution series.
3)
The Novarossi Toro Nero features a new and previously unused locking mechanism for the cylinder liner in the engine casing. The locking pin is not located at the front or rear, but rather on the left side when viewed from the front. The bore/stroke ratio is also unusual: resulting in an extremely long stroke engine. Another notable feature is the crankshaft, which is balanced once and has a diameter of 14.5mm. This necessitates new ball bearings, not the front bearings, but the main bearing. The front bearing is the new 7x19x6 bearing with both seals facing outwards, featuring a plastic cage. The main bearing now measures 14.5x26x5.7mm. The crankshaft is also hollow-drilled, but unfortunately not potted with silicone, which does not allow for optimal intake of the fresh air/fuel mixture.
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C6BB + C6BB T7 The exhaust timing of these two engines is unique in that, although symmetrical, it still has two different timings. The engine features the so-called MES (Multi-Exhaust System), which means that the exhaust port is divided into three channels: a large main exhaust port in the center and two smaller exhaust ports on either side. This system was previously used in the C5 engine, although in that case all the ports were at the same height. With the C6BB and C6BB T7, this is different. The smaller exhaust ports only close at a crankshaft angle of 180° (C6BB 90°+90°, as the valve timing of the cylinder liner is always symmetrical!) and 174° (C6BB T7), while the main exhaust port closes at 160° (80°+80°, both engines). This means the main port remains closed longer after combustion. (Always starting from a 0° angle when the piston is at bottom dead center!) This promises a significant increase in torque without sacrificing engine speed.
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SIRIO .27 3-Channel Monster. This engine is available in the same size as both a 3-channel and a 7-channel version. Anyone who thinks the only difference is the running gear is sadly mistaken! The 3-port engine has a completely different crankshaft than the 7-port engine. It's clear that significant rework is possible. While casting the crankshaft isn't necessary for the 7-port engine, it's definitely recommended for the 3-port engine, as it's evident that it was produced more cheaply and with less attention to detail. Furthermore, the Sirio website shows the 3-port engine with an aluminum carburetor, which is no longer accurate, as it now uses a plastic compound carburetor. There are also two versions of the 7-port engine: one with a pull starter and one for a starter box. The difference lies in the fact that the Pro engine doesn't have a pull starter and consequently has a different rear cover and a different crankshaft, which, apart from the drive pin for the pull starter, is identical to the 7-port pull-start engine.
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Sirio .28 STI Monster. What struck me about this engine is that it essentially only uses the casing from the Sirio Kanai EVOII 3.5cc class. Only the casing was bored out slightly! The cylinder liner is therefore relatively thin-walled, but overall it makes a very good impression. Regarding the issue of the piston pin circlips repeatedly coming loose and causing engine damage, I noticed that the groove in which the circlip sits looks very deformed. It's possible, of course, that the tool used to manufacture the groove had already reached or even exceeded its maximum lifespan, or perhaps was damaged unnoticed, so that a certain series of engines were produced with this defect before the standard tool change. The rework isn't great, but the deformed areas prevent the circlip from engaging precisely. A lost circlip is therefore almost inevitable. However, it should be sufficient to remove the burr in the groove and reinstall the circlip. However, it's not easy for someone who doesn't own a microscope or at least a magnifying glass of that size –beyond good and evil– Also noticeable is the huge gap of 0.85mm (normally everything between 0.6 and 0.7mm with 25% nitro); here, with poor adjustability, you might be able to remove 2/10ths.
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Thunder Tiger PRO 21R. Please note that there are different versions of this engine. While the TTR engines in the Pro21R series share the same designation on the casing, they have different cylinder heads and crankshafts with diameters of 13 and 14 mm. This results in different valve timing for each engine. Consequently, differences in running characteristics, performance, and fuel consumption may occur.
timing.1789078347.txt.gz · Last modified: by nitroadmin